Classification of Hadamard matrices of order 28

Classification of Hadamard matrices of order 28
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28 阶 Hadamard 矩阵的分类

DOI:
10.1016/0012-365x(94)90024-8
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发表时间:
1994
期刊:
Discret. Math.
影响因子:
--
通讯作者:
Hiroshi Kimura
Hiroshi Kimura
中科院分区:
--
文献类型:
--
作者:
Hiroshi Kimura

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我们用 28 阶霍尔集构造了所有不等价的 Hadamard 矩阵,并通过与 Hadamard 矩阵相关的 K 矩阵进行分类,除了我们早期工作中的五个矩阵(Kimura,1988)(另请参见 Kimura,即将出现;Kimura 和 Ohmori,1987)。在本文中,我们证明具有平凡 K 矩阵的 Hadamard 矩阵等价于 GF(27) 中的平方定义的 Paley 矩阵。通过这个定理,我们得到了 28 阶 Hadamard 矩阵的完整分类,并且我们有不等价的 28 阶 Hadamard 矩阵。
We constructed all inequivalent Hadamard matrices with Hall sets of order 28 and classified byK-matrices associated with Hadamard matrices except five matrices in our earlier work (Kimura, 1988)(see also Kimura, to appear; Kimura and Ohmori, 1987). In this paper we prove that Hadamard matrices with the trivialK-matrix are equivalent to the Paley matrix defined by the squares in GF(27). By this theorem we get a complete classification of Hadamard matrices of order 28 and we have inequivalent Hadamard matrices of order 28.